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The second time is the fat after the flower. This time, the top dressing should be carried out immediately after the falling flower to reduce the physiological drop, promote the growth of new shoots and enlarge the leaf area. The first and second topdressing should be closely combined with the application of quick-acting nitrogen fertilizer. The mature manure of each plant is 100 kg of manure or 1 kg of urea.
The third time is the top dressing during fruit enlargement and flower bud differentiation. At this time, the fruit rapidly expands, the flower buds begin to differentiate, and the reproductive growth and vegetative growth are sharply contradictory. Applying appropriate amounts of nitrogen, phosphorus and potassium fertilizers in time can improve the photosynthetic effect of the leaves, promote nutrient accumulation, and satisfy the fruit enlargement and flower bud differentiation for nutrition. demand.
The fourth time was to stop growing and topdressing at the autumn tip. The main function is to improve the photosynthetic function of the leaves, increase the accumulation of nutrients in the late stage of the tree, and promote the continued differentiation and fullness of the flower buds. For the third and fourth top dressings, the adult trees were given 50 kg of excrement, 1 kg of superphosphate and 0.5 kg of potassium sulfate. The fourth fertilization time: early maturing and medium maturity varieties can be carried out after harvesting, and late maturing varieties should be carried out before harvesting.
In addition to regular fertilization, 250 times of borax aqueous solution was sprayed at the flowering stage; 200 times of urea or calcium phosphate leaching solution or potassium sulfate aqueous solution was sprayed during the fruit expansion period, and the effect was good. Water should be poured in time after each fertilization.
Fruit tree four times a year fertilization
The first top dressing should be pre-flowering. When the fruit tree sprouts and flowers, it consumes a lot of nutrients. If the nutrient supply is not available, the flowering period will be prolonged and the fruit setting rate will be reduced. Therefore, it is necessary to apply the quick-acting fertilizer in an appropriate amount.
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